>> at the california academy of sciences, there is a very large collection of preserved and live specimens, which are the evidence about evolution. we have the assassin spiders, which are spiders that exclusively kill and eat other spiders. they are under the microscope here. research done and the california academy's i rhinology lab suggests that the assassin spiders have been doing this for over 150 million years. this glassed in room is a real scientific laboratory, and the people in that room are preparing specimens of vertebrate, that is mammals and birds. the way they do this is to remove the skin, sew it together in a relatively lifelike pose, and ensure that it does not decompose.